A body at rest breaks up into `3` parts. If `2` parts having equal masses fly off perpendicularly each after with a velocity of `12 m//s` when the velocity of the third part which has `3 times` mass of each part is

A. `4sqrt(2)m//s` at an angle of `45^(@)` from each body

B. `24sqrt(2)m//s` at an angle of `135^(@)` from each body

C. `6sqrt(2)m//s` at `135^(@)` from each body

D. `4sqrt(2)m//s` at `135^(@)` from each body